Since kdrive, in particular Xfbdev has been dropped, this has left a hole in support for MONO (1bpp) framebuffer devices. I've been using Xfbdev for a picolcd mono matrix device for a few years.
The Xorg fbdev driver only supports a minimum of 8bpp framebuffer formats which wasn't a problem given the existance of Xfbdev, but now leaves a whole class of hardware unsupportable.
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